Purpose Lynch syndrome (LS) is a hereditary condition MSH2, MLH1, MSH6, and PMS2 was performed on all co- that increases one’s risk of developing colorectal, endo- lorectal tumor resections from patients ≤70 years old and all metrial, and other extracolonic cancers. MD Anderson stage II cancers. Tumors with loss of MLH1/PMS2 were sub- Cancer Center at Cooper implemented a reflex screening sequently tested for BRAF mutation or MLH1 promoter meth- protocol for DNA mismatch repair (dMMR) deficiency. ylation to identify tumors with likely epigenetic inactivation Those with findings suspicious for LS were referred for of MLH1. Patients with loss of MLH1/PMS2 without BRAF genetic counseling (GC). Our goal was to assess compli- mutations or with absence of MLH1 promoter methylation ance with GC and factors associated with successful and those with loss of MSH2/MSH6 were referred to GC. follow-up. Compliance with GC was assessed. Results Between March 2014 and August 2016, 203 tumors were tested by IHC. Fifteen (7.4%) patients had abnormal MMR protein expression patterns in the absence of BRAF mutation or MLH1 promoter methylation suggestive of possi- * Robin F. Irons email@example.com ble LS. GC compliance was 35.7% overall and 85.7% in those with family history of
International Journal of Colorectal Disease – Springer Journals
Published: Jun 29, 2017
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